//
// Created by timo on 03.04.25.
//

#ifndef VULKAN_APP_H
#define VULKAN_APP_H

#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>

#define GLM_FORCE_RADIANS
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>

#include <iostream>
#include <stdexcept>
#include <cstdlib>
#include <cstring>
#include <cstdint>
#include <vector>
#include <optional>
#include <set>
#include <limits>
#include <algorithm>
#include <fstream>
#include <array>
#include <chrono>

namespace vapp{
    // Change here for other presentMode
    const VkPresentModeKHR WISHED_PRESENT_MODE = VK_PRESENT_MODE_MAILBOX_KHR;

    struct Vertex{
        glm::vec2 pos;
        glm::vec3 color;

        static VkVertexInputBindingDescription getBindingDescription(){
            VkVertexInputBindingDescription bindingDescription{};
            bindingDescription.binding = 0;
            bindingDescription.stride = sizeof(Vertex);
            bindingDescription.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
            return bindingDescription;
        }

        static std::array<VkVertexInputAttributeDescription, 2> getAttributeDescriptions(){
            std::array<VkVertexInputAttributeDescription, 2> attributeDescriptions{};

            attributeDescriptions[0].binding = 0;
            attributeDescriptions[0].location = 0;
            attributeDescriptions[0].format = VK_FORMAT_R32G32_SFLOAT;
            attributeDescriptions[0].offset = offsetof(Vertex, pos);

            attributeDescriptions[1].binding = 0;
            attributeDescriptions[1].location = 1;
            attributeDescriptions[1].format = VK_FORMAT_R32G32B32_SFLOAT;
            attributeDescriptions[1].offset = offsetof(Vertex, color);

            return attributeDescriptions;
        }
    };

    // TODO: Remove
    const std::vector<Vertex> vertices = {
        {{-0.5f, -0.5f}, {0.0f, 1.0f, 0.0f}},
        {{0.5f, -0.5f}, {0.0f, 0.0f, 1.0f}},
{{0.5f, 0.5f}, {0.0f, 1.0f, 0.0f}},
{{-0.5f, 0.5f}, {1.0f, 0.0f, 0.0f}}
    };

    // uint16_t also possible -> change in vkCmdBindIndexBuffer also
    const std::vector<uint32_t> indices = { 0, 1, 2, 2, 3, 0 };
    // END Remove

    struct UniformBufferObject{
        glm::mat4 model;
        glm::mat4 view;
        glm::mat4 proj;
    };

    struct QueueFamilyIndices{
        std::optional<uint32_t> graphicsFamily;
        std::optional<uint32_t> presentFamily;

        bool isComplete(){
            return graphicsFamily.has_value();
        }
    };

    struct SwapChainSupportDetails{
        VkSurfaceCapabilitiesKHR capabilities;
        std::vector<VkSurfaceFormatKHR> formats;
        std::vector<VkPresentModeKHR> presentModes;
    };

    static std::vector<char> readFile(const std::string& filename);
    static std::array<VkVertexInputAttributeDescription, 2> getAttributeDescription();


    class Vulkan{
    private:
#pragma region Fields
        GLFWwindow *window;
        uint32_t _width, _height;

        VkInstance instance;
        VkDebugUtilsMessengerEXT debugMessenger;

        VkSurfaceKHR surface;

        VkPhysicalDevice physicalDevice = VK_NULL_HANDLE;
        VkDevice device;

        VkQueue graphicsQueue;
        VkQueue presentQueue;

        VkSwapchainKHR swapChain;
        std::vector<VkImage> swapChainImages;
        VkFormat swapChainImageFormat;
        VkExtent2D swapChainExtent;

        std::vector<VkImageView> swapChainImageViews;

        VkRenderPass renderPass;
        VkDescriptorSetLayout descriptorSetLayout;
        VkPipelineLayout pipelineLayout;

        VkPipeline graphicsPipeline;

        VkCommandPool commandPool;
        std::vector<VkCommandBuffer> commandBuffers;

        std::vector<VkSemaphore> imageAvailableSemaphores, renderFinishedSemaphores;
        std::vector<VkFence> inFlightFences;

        std::vector<VkFramebuffer> swapChainFramebuffers;

        const int MAX_FRAMES_IN_FLIGHT = 2;
        uint32_t currentFrame = 0;

        VkBuffer vertexBuffer;
        VkDeviceMemory vertexBufferMemory;
        VkBuffer indexBuffer;
        VkDeviceMemory indexBufferMemory;

        std::vector<VkBuffer> uniformBuffers;
        std::vector<VkDeviceMemory> uniformBuffersMemory;
        std::vector<void*> uniformBuffersMapped;

        VkDescriptorPool descriptorPool;
        std::vector<VkDescriptorSet> descriptorSets;
#pragma endregion

        bool checkValidationLayerSupport();
        std::vector<const char*> getRequiredExtensions();

        void createInstance();
        void setupDebugMessenger();
        void pickPhysicalDevice();
        void createLogicalDevice();
        QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device);
        bool checkDeviceExtensionSupport(VkPhysicalDevice device);
        bool isDeviceSuitable(VkPhysicalDevice device);
        void createSurface();
        SwapChainSupportDetails querySwapChainSupport(VkPhysicalDevice device);
        VkSurfaceFormatKHR chooseSwapSurfaceFormat(const std::vector<VkSurfaceFormatKHR>& availableFormats);
        VkPresentModeKHR chooseSwapPresentMode(const std::vector<VkPresentModeKHR> availablePresentModes);
        VkExtent2D chooseSwapExtent(const VkSurfaceCapabilitiesKHR& capabilities);
        void createSwapChain();
        void createImageViews();
        void createDescriptorSetLayout();
        void createGraphicsPipeline();
        VkShaderModule createShaderModule(const std::vector<char>& code);
        void createRenderPass();
        void createFrameBuffers();
        void createCommandPool();
        uint32_t findMemoryType(uint32_t typeFilter, VkMemoryPropertyFlags properties);
        void createBuffer(VkDeviceSize size, VkBufferUsageFlags usage, VkMemoryPropertyFlags properties, VkBuffer &buffer, VkDeviceMemory &bufferMemory);
        void copyBuffer(VkBuffer srcBuffer, VkBuffer dstBuffer, VkDeviceSize size);
        void createVertexBuffer();
        void createIndexBuffer();
        void createUniformBuffers();
        void createDescriptorPool();
        void createDescriptorSets();
        void createCommandBuffers();
        void recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex);
        void createSyncObjects();
        void updateUniformBuffer(uint32_t currentFrame);
        void drawFrame();
        void cleanupSwapChain();
        void recreateSwapChain();
        void initWindow(const char *windowName);
        void initVulkan();
        void mainLoop();
        void cleanup();

    public:
#ifdef DEBUG
        const bool enableValidationLayers = true;
#else
        const bool enableValidationLayers = false;
#endif

        bool framebufferResized = false;

        void run(const char *windowName, const uint32_t width = 800, const uint32_t height = 600);
    };
} // vapp

#endif //VULKAN_APP_H